watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-09T17:08:04Z. The update package is 680.58 MB. This is a delta (partial) update that requires 3.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 29a1ce709c80c71b2f28fe1ed257928d11c683d6.zip.